People learn at different speeds. But 1300 players are almost certainly not cheating...
There's no way a person who has only been playing for a couple of days could be rated 1300 legitimately.
Why?
Because you simply could not reach that level in two days from "scratch".
What sort of skills does it take to reach a 1300 level..? Not hanging stuff every move?
About rating. The startingpoint is 1200, and I think you pop up to above 1300 if you win your first game. After that it is possible to hold that rating if you only play lowrated players and avoid loosing. I popped up to 1620 after 3,4 or 5 games, and after that i met only strong players and fell down to around 1330, before starting a long slow climb